Cavity build-up of coherent undulator synchrotron radiation emitted by periodic electron bunches is investigated. At the optimal off-grazing resonance, the bunch slippage relative to the radiation pulse introduces an initial transient period during which radiation accumulates cooperatively as if it is emitted by a single bunch. The power growth during the period is quadratic to the number of bunches. The number of cooperative bunches is ～ 2 ? s 2, where ? s denotes the slippage length in units of the resonant wavelength.
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机译：研究了周期性电子束发射的相干波荡器同步加速器辐射的空穴积累。在最佳的放牧共振下，束相对于辐射脉冲的滑移会引入一个初始瞬变周期，在此期间，辐射会协同累积，就像它是由单个束发出的一样。在此期间，功率增长是束数的平方。协作束数为〜2？ s 2，在哪里？ s表示以共振波长为单位的滑动长度。
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